Co-integrating a cryo-CMOS SoC with nitrogen-vacancy (NV) centers in diamond enables a scalable quantum platform. This work introduces a combined Class-DE RFDAC and class-D PDM driver for multi-qubit electron- and nuclear-spin control. A switch allows shared coil driving enabling multi-band 2.5-3.2GHz(1.9-2.1MHz), large-current 70mA(38mA), high-Rabi frequency 2.31MHz(1.93kHz) and high-fidelity 99.34(3)%(99.78(2)%) electron(nuclear) quantum logic gates with decoupled coherence times >50ms. ... Read more

Color centers in diamond are a promising quantum-computing platform due to their long coherence times and operation at elevated cryogenic temperatures. This paper presents a 40-nm cryo-CMOS digital-intensive controller that employs a class-D amplifier with a 1-bit Δ Σ quantizer to generate precise, low-noise MHz pulses for nuclear-spin control, and a polar architecture to produce envelope-shaped GHz pulses for electron-spin control. The controller further features merged differential GHz/MHz output drivers, enabling seamless mode switching between electron- and nuclear-spin control. Implemented in 40- nm CMOS and measured at 4 K, the controller meets the requirements for 99.99 % qubit control fidelity and delivers higher output current with improved efficiency at higher operating frequencies compared to prior art. ... Read more